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  <div class="col-xs-12 col-sm-9 col-md-8 main-content">
    <h1>HttpHeaders class</h1>

    <section class="desc markdown">
      <p>Headers for HTTP requests and responses.</p>
<p>In some situations, headers are immutable:</p><ul><li>
<p>HttpRequest and HttpClientResponse always have immutable headers.</p></li><li>
<p>HttpResponse and HttpClientRequest have immutable headers
from the moment the body is written to.</p></li></ul>
<p>In these situations, the mutating methods throw exceptions.</p>
<p>For all operations on HTTP headers the header name is
case-insensitive.</p>
<p>To set the value of a header use the <code>set()</code> method:</p>
<pre class="language-dart"><code>request.headers.set(HttpHeaders.CACHE_CONTROL,
                    'max-age=3600, must-revalidate');
</code></pre>
<p>To retrieve the value of a header use the <code>value()</code> method:</p>
<pre class="language-dart"><code>print(request.headers.value(HttpHeaders.USER_AGENT));
</code></pre>
<p>An HttpHeaders object holds a list of values for each name
as the standard allows. In most cases a name holds only a single value,
The most common mode of operation is to use <code>set()</code> for setting a value,
and <code>value()</code> for retrieving a value.</p>
    </section>
    

    <section class="summary offset-anchor" id="constructors">
      <h2>Constructors</h2>

      <dl class="constructor-summary-list">
        <dt id="HttpHeaders" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/HttpHeaders.html">HttpHeaders</a></span><span class="signature">()</span>
        </dt>
        <dd>
          
        </dd>
      </dl>
    </section>

    <section class="summary offset-anchor" id="instance-properties">
      <h2>Properties</h2>

      <dl class="properties">
        <dt id="chunkedTransferEncoding" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/chunkedTransferEncoding.html">chunkedTransferEncoding</a></span>
          <span class="signature">&#8596; <a href="dart-core/bool-class.html">bool</a></span>
        </dt>
        <dd>
          Gets and sets the chunked transfer encoding header value.
          <div class="features">read / write</div>
</dd>
        <dt id="contentLength" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/contentLength.html">contentLength</a></span>
          <span class="signature">&#8596; <a href="dart-core/int-class.html">int</a></span>
        </dt>
        <dd>
          Gets and sets the content length header value.
          <div class="features">read / write</div>
</dd>
        <dt id="contentType" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/contentType.html">contentType</a></span>
          <span class="signature">&#8596; <a href="dart-io/ContentType-class.html">ContentType</a></span>
        </dt>
        <dd>
          Gets and sets the content type. Note that the content type in the
header will only be updated if this field is set
directly. Mutating the returned current value will have no
effect.
          <div class="features">read / write</div>
</dd>
        <dt id="date" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/date.html">date</a></span>
          <span class="signature">&#8596; <a href="dart-core/DateTime-class.html">DateTime</a></span>
        </dt>
        <dd>
          Gets and sets the date. The value of this property will
reflect the 'date' header.
          <div class="features">read / write</div>
</dd>
        <dt id="expires" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/expires.html">expires</a></span>
          <span class="signature">&#8596; <a href="dart-core/DateTime-class.html">DateTime</a></span>
        </dt>
        <dd>
          Gets and sets the expiry date. The value of this property will
reflect the 'expires' header.
          <div class="features">read / write</div>
</dd>
        <dt id="host" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/host.html">host</a></span>
          <span class="signature">&#8596; <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          Gets and sets the host part of the 'host' header for the
connection.
          <div class="features">read / write</div>
</dd>
        <dt id="ifModifiedSince" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/ifModifiedSince.html">ifModifiedSince</a></span>
          <span class="signature">&#8596; <a href="dart-core/DateTime-class.html">DateTime</a></span>
        </dt>
        <dd>
          Gets and sets the "if-modified-since" date. The value of this property will
reflect the "if-modified-since" header.
          <div class="features">read / write</div>
</dd>
        <dt id="persistentConnection" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/persistentConnection.html">persistentConnection</a></span>
          <span class="signature">&#8596; <a href="dart-core/bool-class.html">bool</a></span>
        </dt>
        <dd>
          Gets and sets the persistent connection header value.
          <div class="features">read / write</div>
</dd>
        <dt id="port" class="property">
          <span class="name"><a href="dart-io/HttpHeaders/port.html">port</a></span>
          <span class="signature">&#8596; <a href="dart-core/int-class.html">int</a></span>
        </dt>
        <dd>
          Gets and sets the port part of the 'host' header for the
connection.
          <div class="features">read / write</div>
</dd>
        <dt id="hashCode" class="property inherited">
          <span class="name"><a href="dart-core/Object/hashCode.html">hashCode</a></span>
          <span class="signature">&#8594; <a href="dart-core/int-class.html">int</a></span>
        </dt>
        <dd class="inherited">
          The hash code for this object. <a href="dart-core/Object/hashCode.html">[...]</a>
          <div class="features">read-only, inherited</div>
</dd>
        <dt id="runtimeType" class="property inherited">
          <span class="name"><a href="dart-core/Object/runtimeType.html">runtimeType</a></span>
          <span class="signature">&#8594; <a href="dart-core/Type-class.html">Type</a></span>
        </dt>
        <dd class="inherited">
          A representation of the runtime type of the object.
          <div class="features">read-only, inherited</div>
</dd>
      </dl>
    </section>

    <section class="summary offset-anchor" id="instance-methods">
      <h2>Methods</h2>
      <dl class="callables">
        <dt id="add" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/add.html">add</a></span><span class="signature">(<wbr><span class="parameter" id="add-param-name"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">name</span>, </span> <span class="parameter" id="add-param-value"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">value</span></span>)
            <span class="returntype parameter">&#8594; void</span>
          </span>
        </dt>
        <dd>
          Adds a header value. The header named <code>name</code> will have the value
<code>value</code> added to its list of values. Some headers are single
valued, and for these adding a value will replace the previous
value. If the value is of type DateTime a HTTP date format will be
applied. If the value is a <code>List</code> each element of the list will
be added separately. For all other types the default <code>toString</code>
method will be used.
          
</dd>
        <dt id="clear" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/clear.html">clear</a></span><span class="signature">(<wbr>)
            <span class="returntype parameter">&#8594; void</span>
          </span>
        </dt>
        <dd>
          Remove all headers. Some headers have system supplied values and
for these the system supplied values will still be added to the
collection of values for the header.
          
</dd>
        <dt id="forEach" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/forEach.html">forEach</a></span><span class="signature">(<wbr><span class="parameter" id="forEach-param-f"><span class="type-annotation">void</span> <span class="parameter-name">f</span>(<span class="parameter" id="f-param-name"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">name</span>, </span> <span class="parameter" id="f-param-values"><span class="type-annotation"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span> <span class="parameter-name">values</span></span>)</span>)
            <span class="returntype parameter">&#8594; void</span>
          </span>
        </dt>
        <dd>
          Enumerates the headers, applying the function <code>f</code> to each
header. The header name passed in <code>name</code> will be all lower
case.
          
</dd>
        <dt id="noFolding" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/noFolding.html">noFolding</a></span><span class="signature">(<wbr><span class="parameter" id="noFolding-param-name"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">name</span></span>)
            <span class="returntype parameter">&#8594; void</span>
          </span>
        </dt>
        <dd>
          Disables folding for the header named <code>name</code> when sending the HTTP
header. By default, multiple header values are folded into a
single header line by separating the values with commas. The
'set-cookie' header has folding disabled by default.
          
</dd>
        <dt id="remove" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/remove.html">remove</a></span><span class="signature">(<wbr><span class="parameter" id="remove-param-name"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">name</span>, </span> <span class="parameter" id="remove-param-value"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">value</span></span>)
            <span class="returntype parameter">&#8594; void</span>
          </span>
        </dt>
        <dd>
          Removes a specific value for a header name. Some headers have
system supplied values and for these the system supplied values
will still be added to the collection of values for the header.
          
</dd>
        <dt id="removeAll" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/removeAll.html">removeAll</a></span><span class="signature">(<wbr><span class="parameter" id="removeAll-param-name"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">name</span></span>)
            <span class="returntype parameter">&#8594; void</span>
          </span>
        </dt>
        <dd>
          Removes all values for the specified header name. Some headers
have system supplied values and for these the system supplied
values will still be added to the collection of values for the
header.
          
</dd>
        <dt id="set" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/set.html">set</a></span><span class="signature">(<wbr><span class="parameter" id="set-param-name"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">name</span>, </span> <span class="parameter" id="set-param-value"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">value</span></span>)
            <span class="returntype parameter">&#8594; void</span>
          </span>
        </dt>
        <dd>
          Sets a header. The header named <code>name</code> will have all its values
cleared before the value <code>value</code> is added as its value.
          
</dd>
        <dt id="value" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/value.html">value</a></span><span class="signature">(<wbr><span class="parameter" id="value-param-name"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">name</span></span>)
            <span class="returntype parameter">&#8594; <a href="dart-core/String-class.html">String</a></span>
          </span>
        </dt>
        <dd>
          Convenience method for the value for a single valued header. If
there is no header with the provided name, <code>null</code> will be
returned. If the header has more than one value an exception is
thrown.
          
</dd>
        <dt id="noSuchMethod" class="callable inherited">
          <span class="name"><a href="dart-core/Object/noSuchMethod.html">noSuchMethod</a></span><span class="signature">(<wbr><span class="parameter" id="noSuchMethod-param-invocation"><span class="type-annotation"><a href="dart-core/Invocation-class.html">Invocation</a></span> <span class="parameter-name">invocation</span></span>)
            <span class="returntype parameter">&#8594; dynamic</span>
          </span>
        </dt>
        <dd class="inherited">
          Invoked when a non-existent method or property is accessed. <a href="dart-core/Object/noSuchMethod.html">[...]</a>
          <div class="features">inherited</div>
</dd>
        <dt id="toString" class="callable inherited">
          <span class="name"><a href="dart-core/Object/toString.html">toString</a></span><span class="signature">(<wbr>)
            <span class="returntype parameter">&#8594; <a href="dart-core/String-class.html">String</a></span>
          </span>
        </dt>
        <dd class="inherited">
          Returns a string representation of this object.
          <div class="features">inherited</div>
</dd>
      </dl>
    </section>

    <section class="summary offset-anchor" id="operators">
      <h2>Operators</h2>
      <dl class="callables">
        <dt id="operator []" class="callable">
          <span class="name"><a href="dart-io/HttpHeaders/operator_get.html">operator []</a></span><span class="signature">(<wbr><span class="parameter" id="[]-param-name"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">name</span></span>)
            <span class="returntype parameter">&#8594; <a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span>
          </span>
        </dt>
        <dd>
          Returns the list of values for the header named <code>name</code>. If there
is no header with the provided name, <code>null</code> will be returned.
          
</dd>
        <dt id="operator ==" class="callable inherited">
          <span class="name"><a href="dart-core/Object/operator_equals.html">operator ==</a></span><span class="signature">(<wbr><span class="parameter" id="==-param-other"><span class="type-annotation">dynamic</span> <span class="parameter-name">other</span></span>)
            <span class="returntype parameter">&#8594; <a href="dart-core/bool-class.html">bool</a></span>
          </span>
        </dt>
        <dd class="inherited">
          The equality operator. <a href="dart-core/Object/operator_equals.html">[...]</a>
          <div class="features">inherited</div>
</dd>
      </dl>
    </section>



    <section class="summary offset-anchor" id="constants">
      <h2>Constants</h2>

      <dl class="properties">
        <dt id="ACCEPT" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/ACCEPT-constant.html">ACCEPT</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;accept&quot;</code></span>
          </div>
        </dd>
        <dt id="ACCEPT_CHARSET" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/ACCEPT_CHARSET-constant.html">ACCEPT_CHARSET</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;accept-charset&quot;</code></span>
          </div>
        </dd>
        <dt id="ACCEPT_ENCODING" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/ACCEPT_ENCODING-constant.html">ACCEPT_ENCODING</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;accept-encoding&quot;</code></span>
          </div>
        </dd>
        <dt id="ACCEPT_LANGUAGE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/ACCEPT_LANGUAGE-constant.html">ACCEPT_LANGUAGE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;accept-language&quot;</code></span>
          </div>
        </dd>
        <dt id="ACCEPT_RANGES" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/ACCEPT_RANGES-constant.html">ACCEPT_RANGES</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;accept-ranges&quot;</code></span>
          </div>
        </dd>
        <dt id="AGE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/AGE-constant.html">AGE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;age&quot;</code></span>
          </div>
        </dd>
        <dt id="ALLOW" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/ALLOW-constant.html">ALLOW</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;allow&quot;</code></span>
          </div>
        </dd>
        <dt id="AUTHORIZATION" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/AUTHORIZATION-constant.html">AUTHORIZATION</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;authorization&quot;</code></span>
          </div>
        </dd>
        <dt id="CACHE_CONTROL" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CACHE_CONTROL-constant.html">CACHE_CONTROL</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;cache-control&quot;</code></span>
          </div>
        </dd>
        <dt id="CONNECTION" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CONNECTION-constant.html">CONNECTION</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;connection&quot;</code></span>
          </div>
        </dd>
        <dt id="CONTENT_ENCODING" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CONTENT_ENCODING-constant.html">CONTENT_ENCODING</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;content-encoding&quot;</code></span>
          </div>
        </dd>
        <dt id="CONTENT_LANGUAGE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CONTENT_LANGUAGE-constant.html">CONTENT_LANGUAGE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;content-language&quot;</code></span>
          </div>
        </dd>
        <dt id="CONTENT_LENGTH" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CONTENT_LENGTH-constant.html">CONTENT_LENGTH</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;content-length&quot;</code></span>
          </div>
        </dd>
        <dt id="CONTENT_LOCATION" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CONTENT_LOCATION-constant.html">CONTENT_LOCATION</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;content-location&quot;</code></span>
          </div>
        </dd>
        <dt id="CONTENT_MD5" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CONTENT_MD5-constant.html">CONTENT_MD5</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;content-md5&quot;</code></span>
          </div>
        </dd>
        <dt id="CONTENT_RANGE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CONTENT_RANGE-constant.html">CONTENT_RANGE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;content-range&quot;</code></span>
          </div>
        </dd>
        <dt id="CONTENT_TYPE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/CONTENT_TYPE-constant.html">CONTENT_TYPE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;content-type&quot;</code></span>
          </div>
        </dd>
        <dt id="COOKIE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/COOKIE-constant.html">COOKIE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;cookie&quot;</code></span>
          </div>
        </dd>
        <dt id="DATE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/DATE-constant.html">DATE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;date&quot;</code></span>
          </div>
        </dd>
        <dt id="ENTITY_HEADERS" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/ENTITY_HEADERS-constant.html">ENTITY_HEADERS</a></span>
          <span class="signature">&#8594; const <a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>const [ALLOW, CONTENT_ENCODING, CONTENT_LANGUAGE, CONTENT_LENGTH, CONTENT_LOCATION, CONTENT_MD5, CONTENT_RANGE, CONTENT_TYPE, EXPIRES, LAST_MODIFIED]</code></span>
          </div>
        </dd>
        <dt id="ETAG" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/ETAG-constant.html">ETAG</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;etag&quot;</code></span>
          </div>
        </dd>
        <dt id="EXPECT" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/EXPECT-constant.html">EXPECT</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;expect&quot;</code></span>
          </div>
        </dd>
        <dt id="EXPIRES" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/EXPIRES-constant.html">EXPIRES</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;expires&quot;</code></span>
          </div>
        </dd>
        <dt id="FROM" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/FROM-constant.html">FROM</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;from&quot;</code></span>
          </div>
        </dd>
        <dt id="GENERAL_HEADERS" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/GENERAL_HEADERS-constant.html">GENERAL_HEADERS</a></span>
          <span class="signature">&#8594; const <a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>const [CACHE_CONTROL, CONNECTION, DATE, PRAGMA, TRAILER, TRANSFER_ENCODING, UPGRADE, VIA, WARNING]</code></span>
          </div>
        </dd>
        <dt id="HOST" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/HOST-constant.html">HOST</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;host&quot;</code></span>
          </div>
        </dd>
        <dt id="IF_MATCH" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/IF_MATCH-constant.html">IF_MATCH</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;if-match&quot;</code></span>
          </div>
        </dd>
        <dt id="IF_MODIFIED_SINCE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/IF_MODIFIED_SINCE-constant.html">IF_MODIFIED_SINCE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;if-modified-since&quot;</code></span>
          </div>
        </dd>
        <dt id="IF_NONE_MATCH" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/IF_NONE_MATCH-constant.html">IF_NONE_MATCH</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;if-none-match&quot;</code></span>
          </div>
        </dd>
        <dt id="IF_RANGE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/IF_RANGE-constant.html">IF_RANGE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;if-range&quot;</code></span>
          </div>
        </dd>
        <dt id="IF_UNMODIFIED_SINCE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/IF_UNMODIFIED_SINCE-constant.html">IF_UNMODIFIED_SINCE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;if-unmodified-since&quot;</code></span>
          </div>
        </dd>
        <dt id="LAST_MODIFIED" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/LAST_MODIFIED-constant.html">LAST_MODIFIED</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;last-modified&quot;</code></span>
          </div>
        </dd>
        <dt id="LOCATION" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/LOCATION-constant.html">LOCATION</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;location&quot;</code></span>
          </div>
        </dd>
        <dt id="MAX_FORWARDS" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/MAX_FORWARDS-constant.html">MAX_FORWARDS</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;max-forwards&quot;</code></span>
          </div>
        </dd>
        <dt id="PRAGMA" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/PRAGMA-constant.html">PRAGMA</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;pragma&quot;</code></span>
          </div>
        </dd>
        <dt id="PROXY_AUTHENTICATE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/PROXY_AUTHENTICATE-constant.html">PROXY_AUTHENTICATE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;proxy-authenticate&quot;</code></span>
          </div>
        </dd>
        <dt id="PROXY_AUTHORIZATION" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/PROXY_AUTHORIZATION-constant.html">PROXY_AUTHORIZATION</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;proxy-authorization&quot;</code></span>
          </div>
        </dd>
        <dt id="RANGE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/RANGE-constant.html">RANGE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;range&quot;</code></span>
          </div>
        </dd>
        <dt id="REFERER" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/REFERER-constant.html">REFERER</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;referer&quot;</code></span>
          </div>
        </dd>
        <dt id="REQUEST_HEADERS" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/REQUEST_HEADERS-constant.html">REQUEST_HEADERS</a></span>
          <span class="signature">&#8594; const <a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>const [ACCEPT, ACCEPT_CHARSET, ACCEPT_ENCODING, ACCEPT_LANGUAGE, AUTHORIZATION, EXPECT, FROM, HOST, IF_MATCH, IF_MODIFIED_SINCE, IF_NONE_MATCH, IF_RANGE, IF_UNMODIFIED_SINCE, MAX_FORWARDS, PROXY_AUTHO…</code></span>
          </div>
        </dd>
        <dt id="RESPONSE_HEADERS" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/RESPONSE_HEADERS-constant.html">RESPONSE_HEADERS</a></span>
          <span class="signature">&#8594; const <a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.html">String</a></span>&gt;</span></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>const [ACCEPT_RANGES, AGE, ETAG, LOCATION, PROXY_AUTHENTICATE, RETRY_AFTER, SERVER, VARY, WWW_AUTHENTICATE]</code></span>
          </div>
        </dd>
        <dt id="RETRY_AFTER" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/RETRY_AFTER-constant.html">RETRY_AFTER</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;retry-after&quot;</code></span>
          </div>
        </dd>
        <dt id="SERVER" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/SERVER-constant.html">SERVER</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;server&quot;</code></span>
          </div>
        </dd>
        <dt id="SET_COOKIE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/SET_COOKIE-constant.html">SET_COOKIE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;set-cookie&quot;</code></span>
          </div>
        </dd>
        <dt id="TE" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/TE-constant.html">TE</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;te&quot;</code></span>
          </div>
        </dd>
        <dt id="TRAILER" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/TRAILER-constant.html">TRAILER</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;trailer&quot;</code></span>
          </div>
        </dd>
        <dt id="TRANSFER_ENCODING" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/TRANSFER_ENCODING-constant.html">TRANSFER_ENCODING</a></span>
          <span class="signature">&#8594; const <a href="dart-core/String-class.html">String</a></span>
        </dt>
        <dd>
          
          
  <div>
            <span class="signature"><code>&quot;transfer-encoding&quot;</code></span>
          </div>
        </dd>
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  <div>
            <span class="signature"><code>&quot;upgrade&quot;</code></span>
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          <span class="name "><a href="dart-io/HttpHeaders/USER_AGENT-constant.html">USER_AGENT</a></span>
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  <div>
            <span class="signature"><code>&quot;user-agent&quot;</code></span>
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        <dt id="VARY" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/VARY-constant.html">VARY</a></span>
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  <div>
            <span class="signature"><code>&quot;vary&quot;</code></span>
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        <dt id="VIA" class="constant">
          <span class="name "><a href="dart-io/HttpHeaders/VIA-constant.html">VIA</a></span>
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  <div>
            <span class="signature"><code>&quot;via&quot;</code></span>
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  <div>
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